Azo dyestuffs.



HERBERT LEVINSTEIN Ann'JAMEs BADDJ'ILEY, or MANCHESTER, ENGLAND, nssienons TO COMPANY or :tnvinsrnm LIMITED, or mnncnnsrnn, ENGLAND. 4

A20 DYIESTUFIIS.

No Drawing.

I To all whom it may concern the general formula (in which Ar and Ar represent aromatic residues) with, on the one hand, a molecular quantity of resorcin, and, on the other hand, a molecular quantityof an azo dye component, for example resorcin,-or other suitable component.

The new dyestufi's dye cotton generally in yellow to red shades which become exceedingly fast to washing when after-treated with formaldehyde. The dyestufl'sthem'selves'are,

in the form of theirsodium salts, dark red to brown powders, soluble in water with usually a reddish color, and yielding as reduction products an a'minoarylacidyldiamin, amino resorcinand the amino derivative of whatever other azo dye component is used.

The following are examples of how this invention may be carried into effect:

Example I: 227 parts of meta-aminobenzoyl-para-phenylenediztmin are converted into the tetrazo compound by means of 138- parts of sodium nitrite and the necessary quantityof hydrochloric acid and combined with 220 parts of resorcin'in a solution made alkaline with sodium carbonate. When the combination is completed the mixture is heated and the dyestufi" salted out. It dyes .cptton a' bright orange which on aftertreatingwith formaldehyde becomes a little redder in shade and very fast to boiling soap and cross-dyeing.

I The new dyestulf has most probably the following cons'titutioma i pH (in l If instead of meta-aminobenzoy1-para Specification of Letters Patent. Patgnted Sept 1141, 1915 Application filed January 20, 19,15. Serial no. 3,389.

fastness, while similar shades are obtained from meta-aminobenzoyl-meta-toluylenedi- 'amin and l-methoxy-EZ (meta-amino-benzoylamino-)t-amino-benzene. Para-amino-benzoyl-para-phenylenediamin on the other hand gives a bright orange red.

Example II: 227 parts of meta-aminobenzoyl-para-phenylenediamin are converted into the tetrazo compound and combined with 202 parts of 12.4.5-toluylenediamin-sulfonie acid in soda alkaline solution. WVhen the formation of the intermediate product isv completedllO parts of resorcin are added to the mixture, which is stirred and kept alkaline until combination is at an end. The, dyestufi is then isolated in the usual manner. It' dyes cotton in orange shades which become redder on after-treating with formaldehyde and are of good fastness'to washing and cross-dyeing.

The new dyestufi' is represented by the structural formula:

-HOaH place of toluylenediamin-sulfonic 'acid in the above example 303 parts of 2.3.6-

naphthylamin-disulfonic acid are used an orange dyestufl is obtained of analogous properties. I Example III: 307 parts of 1(meta-am1nobenzoyl amino) -3-amino-benzene-4-sulfonic acid are converted into the tetrazo compound by means of 138 parts of sodium nitrite and the necessary quantity of hydrochloric acid.

5 and combined with 220 parts of resorcin in a soda alkaline solution. The resulting dye stuff issalted out. It dyes cotton a yellow shade which becomes extremely fast by aftertreating with formaldehyde.

A very bright orange of similar fastness is given by using meta-aminobenzoyl-paraphenylenediamin sulfonic acid, while metaaminobenzoyl-l.4-naphthalenediamin=6 sulfonic acid gives a yellow-brown.

What we claim is-:- 1. A20 dyestuffs obtainable by combining an amino-benzoylarylenediamin of the homologous series of which aminobenzoylphenylenediamin is the lowest member, at least one molecular proportion of .resorcin and a further molecular proportion of an azo dye component of the aromatic series,

which dyestuffs arein the form of their sodium salts, dark red to brown powders, soluble in water with usually a reddish color and yielding as reduction products an aminobenzoylarylenediamin, at least one molecular proportion of aminoresorcinand a further molecular proportion of the amino'derivative of the additional component used; dyeing cotton generally in yellow to red shades when after treated with formaldehyde.

2. An azo dye, obtainable by combining meta-amino-benzoylparaphenylenedi amin with two molecular proportions of rewhich become exceedingly fast to washing sorcin, dyeing cotton bright orange which on treatment with formaldehyde becomes redder and very fast to boiling soap and crossdyeing. v

In witness whereof we have-hereunto set our hands in the presence'of two subscribing HERBERT LEVINSTEIN. 4 JAMES BADD ILEY. Witnesses:

ERNALD SIMPSON MosELEY, MALCOLM LONETHU'RST.

witnesses. 

